Update transformer.stub (#226)

Author: osbre

src/Console/stubs/transformer.stub

@@ -11,7 +11,7 @@ class DummyClass extends TransformerAbstract
      *
      * @var array
      */
-    protected $defaultIncludes = [
+    protected array $defaultIncludes = [
         //
     ];
 
@@ -20,7 +20,7 @@ class DummyClass extends TransformerAbstract
      *
      * @var array
      */
-    protected $availableIncludes = [
+    protected array $availableIncludes = [
         //
     ];